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Image projection lens and mirror system with spherical aberration correction means

US 2,477,331 A · Inventors: EPSTEIN DAVID W

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Listed from its USPTO record in Patent Yard's full-term archive. Its claims, description and drawings are in the USPTO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Granted July 26, 1949. A patent granted before 1976 lasted at most 17 years from grant, so its term ended by July 26, 1966.
  • We check US rights only. Old patents can still inspire new ones: improvements may be patentable.
FiledSeptember 27, 1944
GrantedJuly 26, 1949
Term endedJuly 26, 1966
Application number—
Classification (CPC)G02B17/086 +2 more
Length3 pages

Timeline

Timeline From USPTO dates

19451948195119541957196019631966Application filedSep 27, 1944Patent grantedJuly 26, 1949Term endedJuly 26, 1966

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comJustia PatentsFull text, claims and classification.patents.justia.comFreePatentsOnlineFull text and PDF.freepatentsonline.comEspacenetForeign family and legal status.European Patent Office

Everything on this page comes from the USPTO record linked above.